Is there a pin-compatible replacement for BAS16LT1G?

Yes, parts like BAS21LT1G and BAS20LT1G are available in the same SOT-23 package and are considered pin-compatible. However, they are not electrically equivalent due to a significant difference in switching speed, which is a critical parameter.

What risks should I check before replacing BAS16LT1G?

The main risk is the reverse recovery time (trr). The BAS16LT1G is a high-speed diode (6ns), while many potential alternatives are much slower (~50ns). Using a slower diode in a high-frequency application can cause timing failures, increased power loss, and circuit malfunction. Always verify the speed requirements of your design.

BAS16LT1G Alternatives, Datasheet & Cross Reference | onsemi

The onsemi BAS16LT1G is a popular high-speed switching diode in a SOT-23 package, valued for its fast 6ns reverse recovery time. Finding a suitable replacement requires matching not only the package and basic ratings but also this critical speed parameter to avoid circuit timing issues.

AI replacement insight

Electrical riskhigh

Vastly different switching speeds (trr 6ns vs 50ns) will impact timing-sensitive circuits.

Package risklow

Candidates share the same SOT-23 package, making them mechanically compatible.

Can it be replaced directly?

No direct, drop-in replacement was found. Alternatives like BAS21LT1G have a compatible package and superior voltage ratings but are significantly slower, which is a critical difference.

Best replacement path

The best replacement path is to source another high-speed switching diode with a reverse recovery time (trr) of 10ns or less. While parts like BAS21LT1G are pin-compatible, their slow speed makes them a high-risk choice.

Main risk

The primary risk is circuit malfunction due to timing issues. Replacing a fast 6ns diode with a 50ns diode can lead to reduced efficiency, signal integrity problems, or complete failure in high-frequency circuits.

Recommended alternatives

Higher voltage rating but much slower switching speed. Not for high-frequency circuits.

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Alternative comparison matrix

Feature / factor	BAS16LT1G	BAS20LT1G	BAS21LT1G	Compatibility / risk
Package	SOT-23	SOT-23 (TO-236)	SOT-23 (TO-236)	SOT-23 (TO-236) — Package matches.; BAS21LT1G: Package matches, likely pin-compatible.
Voltage	100V	200V	250V	200V / 250V — Higher voltage rating.; BAS21LT1G: Higher voltage rating provides more margin.
Reverse Recovery Time	6ns	50ns	50ns	50ns — Much slower than target; unsuitable for high-speed switching.; BAS21LT1G: Much slower than target; unsuitable for high-speed switching.
Current	200mA	-	200mA	200mA — Forward current rating matches.
Capacitance	2.0pF	-	5.0pF	5.0pF — Higher capacitance may impact high-frequency performance.

Application & sourcing insights

Questions & answers

Currently, no direct drop-in replacement is confirmed. Alternatives like onsemi's BAS21LT1G offer a compatible package and higher voltage but are much slower (50ns trr vs 6ns). This makes them suitable only for low-speed applications and requires careful engineering review.